<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
		var a=[];
		a[0]="haha";
		var aa=a[0];
		console.log(aa);
		var ss=".45";
		var a=ss.split(".");
		console.log(a[0]);
		</script>
	</body>
</html>
